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Utläggning och provtagning av obundet bärlager – simulering med hjälp av DEM

Construction and sampling of unbound bearing layer - simulation using DEM

The project aims to provide a basis for advice and recommendations ("Best practice") aimed at construction contractors and infrastructure owners when laying and sampling unbound materials as well as methodology for simulating future construction with circular materials. The starting point in the current project is the construction and sampling of base course layers with a grain size distribution of 0-32 mm. Through simulations using the discrete element method (DEM), it becomes clear how different construction methods affect the grain size distribution at different points, and through DEM find out the best way to take samples to verify this. The DEM simulations are verified with selected field measurements. Separation of unbound material in, for example, a road construction means that some parts will contain too fine material and other parts will be too coarse-grained and single-graded. Both parts have a negative impact on the stability and stiffness of the unbonded layer. This, in turn, can lead to increased rutting and cracking of the overlying bonded layers with an impact on the function of the structure. With a digital simulation methodology, the best way to construct unbound materials and how these should be sampled as verification can be tested before laying out and thus avoid "trial and error". It will thus be easier to also study the effect of starting to use circular materials.